Watch



(No m A. 0. JENNINGS.

WATCH.

No. 372,754. Patented Nov. 8, 1887.

INVENTOR ATTORNEYS Nv PETERS, PlwlwLllhogmplmr. mshinglon, D. c.

UNITED STATES PATENT OFFICE.

ARTHUR 0. JENNINGS, OF SOUTHPORT, CONNECTICUT.

ESPEC'IFICATION forming part of Letters Patent No. 372,754, dated November Application filed March 18, 1987. Serial No. 231,388. (No model.)

To all whom it may concern:

Be it known that I, ARTHUR 0. JENNINGS, a resident of Southport, Fairfield county, Gonnecticut, have invented new and useful Improvements in Vatches, of which the following is a full, clear, and exact description.

The object of my invention is to so improve the construction of watches that the mainspring may be removed therefrom without the necessity of taking thewatch apart; also, to provide a new setting device for the hands which will be separate from the winding-gear and so arranged that the movement may be conveniently Withdrawn from the case.

The invention consists in providing a slot in the back plate of the watch, through which slot projects the end of the arbor ot' the mainspring. This arbor is journaled in the faceplate of the watch, and also in a separate plate secured to the outside of the back plate and over the slot in same. The projecting portion of the arbor carries the toothed wheel which gears with the pinion on the winding-stem. A spring-pawl engages with the said toothed wheel. To withdraw the mainspring and barrel from the movement, it is only'necessary to remove the separate journal-plate, when the arbor of the mainspringmay be passed through the slot in the back plate and out of the movement.

The hand-setting part of my invention consists of a rod suitablyjournaled in the movement to slide in the direction of its length, near the inner end of which is secured a pinion which projects through a T-shaped slot of the face-plate. In the narrow part of this slot said pinion can belocked, while it is free to be turned when drawn into the wider portion of the slot.

To make my invention more clear, I will now describe it in connection with the accompanying drawings, which form part of this specification, and in which- Figure l is a broken sectional face view of a watch embodying my improvements. Fig. 2 is a section taken on the line 7t 70, Fig. 3. Fig. 3 is a face View of the movement, the dial-plate being removed, showing my improved hand-setting device. Fig. 4 is a view of the back plate, the separate journal-plate being partly broken away, showing part of the spring winding-gear. Fig. 5 is a lace view of theseparatejournal plate, and Fig. 6 is a detail view of the spring-pawl.

A is the casing, and B the winding-stem, of a watch, said stem carrying the pinion Z), as shown.

C is the face-plate, and D the back plate, of the watch-movement, which consists of the ordinary or a suitable train of gearing.

The back plate, D, is provided with a slot, d, through which projects one end of the arbor c of the mainspring-drum E. The projecting end of the arbor e is journaled in a separate plate, F, which is suitably secured to the back plate D, and which covers the slot (1. Between the back plate, D, and the plate F the arbor c carries the toothed wheel G. The opposite end of the arbor c is journaled in plate 0, so that when wheel G is revolved by the stem the arbor 0 will be turned, in its turn winding the spring.

Attached to the inner face of the back plate D is an L-shaped pawl, g, the short arm of which projects through the plate D and engages the teeth of the Wheel G, preventing its turning in a direction contrary to that desired.

To remove the mainspring and barrel, a pin is first inserted in the hole t in the plate F, which releases the pawl g from engagement with the wheel G, thereby allowing the spring to run down. from the plate D, when the barrel E may be withdrawn from the movement, the longer projecting end of the arbor c passing through the slot (1 in plate D.

From this it will be seen that it is not necessary to remove either plate 0 or D to withdraw the mainspring, and therefore the train of gearing of the movement is not disturbed, making the repairing of the mainspring of a watch comparatively easy, it being a tedious and somewhat lengthy operation to return all the arbors of the several wheels to their respective bearings after a plate in an ordinary watch has been removed. The hole 2' is so located that the pin put through it will reach the pawl but will not touch the wheel G, being outside of the same.

1 is the sliding hand'setting arbor, carrying The plate F is then removed the hand-setting wheel 0. This wheel extends in part through a T-shaped or L-shaped slot, p, in plate C. The arbor P is of such a length that when thepinion 0 is in the narrow part of the slot 1) the outer end of said arbor will align about with the rim of the plate D. The outer end of arbor l is screw-threaded, to receive a finger-piece, Q, the head of which will be outside of the case A, through which it passes.

To set the handsfthe arbor P is r rawn'ont until the pinion 0 enters the wider part of the slot p, and gears with spur wheel ll. By then turning said arbor P, said wheel H will be revolved,and thereby the hands set. Alter the hands are set, the arbor P is pushed back and the pinion passed into the narrow part of the slot p,where it engages with the edge (1 of said slot, which prevents its further revolution.

\Vhen the movement is to be removed from the case A, the linger-piece Q can be unscrewed, while the wheel 0, locked in the narrow part of the slot p, prevents the arbor P from revolving. The movement can there upon be withdrawn from the ease.

Having now described my invention,what I claim is-- l. The plate i), having slot (Z and pawl g, projecting through same, in combination with the plate F. mainspring-barrel E, its arbor 0, and wheel G, substantially as described.

2. Wheel G on arbor a, placed between slotted plates D and F, in combination with said plates, the arbor entering the slot of plate D, substantially as described.

3. The L-shaped pawl g on slotted plate D, adapted to engage wheel G, in combination with said wheel G and plate F, having hole 2', substantially as described.

l. The mainspring-arbor c, journaled in plate (3 and passing through slot (Z in plate D, in. combination with the plate 0 D, pawl 9, plate F, having pin-hole t, and wheel G on arbor c, which wheel G gears with windingpinion I), substantially as herein shown and described.

5. The sliding rod P, havin setting-pinion 0, in combination with the plate C, having a slot, 2),. wider at one end than at the other, whereby the pinion can be prevented from turning, substantially as herein shown and described.

6. The combination of the sliding handsetting arbor P, having pinion 0 and threaded outer end,with theplate 0, having slotp,wider at one end than at the other, and with the threaded finger-piece Q, substantially as described.

A. 0. JENNINGS.

W1 t n esses:

HARRY M. TURK, Ornrnnns G. M. THOMAS. 

